104 POULTRY LABORATORY GUIDE 



regard to color differ greatly in various locali- 

 ties; for instance, the New York market de- 

 mands an egg with a clear white shell, and the 

 Boston market pays a premium for a dark brown 

 shell. 



The size of the air cell must be determined by 

 candling and is the safest test of freshness. In a 

 strictly fresh egg it is about half an inch in diam- 

 eter, and constantly grows larger as evaporation 

 takes place. 



In scoring for weight of total sample deduct 

 two points for every one quarter pound under 

 perfect weight. It is very desirable that the 

 entire sample should be uniform with reference 

 to weight, color, and shape ; any defects in this 

 uniformity clause should be severely cut. 



Grade a large number of eggs into the follow- 

 ing classes, which form the requirements of the 

 Boston market : — 



Extra. Large, brown, and fresh in every way. 

 Weight two pounds or more per dozen. 



Firsts. Good eggs as regards color (brown). 

 Fair size. Weight one and three quarters 

 pounds per dozen. 



Ordinary. Mixed, weight one and one half 

 pounds per dozen. 



The New York market has for many years 

 regarded the eggs of the White Leghorn as the 



